i was a child of john f. kennedy promising that we would go to the moon, and so this was very much part of my upbringing, and i wanted to up, again, share my enthusiasm for a subject that is why, when misunderstood. this is -- >> host: this is from it terry jonathan more in sumter, south carolina. mr. davis mentioned, don't know much song was the inspiration for his book series title. when a phrase is already used in the media, how did the permissions and royalties work when a later person uses the same phrase to back. >> guest: i am not a copyright or a legal expert in this area, so i really prefer not to answer that. it is a very troubling and -- i shouldn't say troubling. it is an area i have no expertise in, so i defer to other authorities on that. >> host: your website is, don't know much about. >> guest: i don't know much. know about. don't know much. >> host: okay. ginnie in rocky mountain, north carolina, please go ahead with your question for kenneth davis. >> caller: thank you so much. i want to kin